MX6.com - View Single Post - helicoil head repair how-to

SleepCounter · 9-6-04, 4:05

Thread a helicoil onto the insertion tool (PermaCoil tool shown) until the tang on the helicoil contacts the spur on the end of the tool.

Then thread the coil into the tapped hole using the insertion tool (Helicoil tool shown)

Note how dirty the upper half of the manifold mating surface is from the leakage of exhaust past the gaskets due to tired threads being unable to clamp the manifold tight.

Once the helicoil is threaded into the tapped hole (at least 3/4 of a turn below flush) and the insertion tool removed, you must break off the tang. Some people recommend just cranking the insertion tool until it breaks, and helicoil says use a flat-nosed drift just slightly smaller than the coil I.D. but I prefer using a little screwdriver blade with a narrow slot ground into it.

I just slide it into the coil and when I feel it straddle the tang, twist it back and forth until the tang breaks off. On larger sizes, needlenose pliers can be used to break off the tank, but they need to be pretty small for an 8 mm coil. Don't forget to give the threaded hole another little blow job to get rid of the tang.

9-6-04, 4:05	#6 (permalink)
SleepCounter Banned Join Date: Mar 2003 Location: Calgary, AB, Canada iTrader: (0)	insert coil, break & remove tang Thread a helicoil onto the insertion tool (PermaCoil tool shown) until the tang on the helicoil contacts the spur on the end of the tool. Then thread the coil into the tapped hole using the insertion tool (Helicoil tool shown) Note how dirty the upper half of the manifold mating surface is from the leakage of exhaust past the gaskets due to tired threads being unable to clamp the manifold tight. Once the helicoil is threaded into the tapped hole (at least 3/4 of a turn below flush) and the insertion tool removed, you must break off the tang. Some people recommend just cranking the insertion tool until it breaks, and helicoil says use a flat-nosed drift just slightly smaller than the coil I.D. but I prefer using a little screwdriver blade with a narrow slot ground into it. I just slide it into the coil and when I feel it straddle the tang, twist it back and forth until the tang breaks off. On larger sizes, needlenose pliers can be used to break off the tank, but they need to be pretty small for an 8 mm coil. Don't forget to give the threaded hole another little blow job to get rid of the tang.